CN108996865B - Pretreatment method and device for biogas production from sludge - Google Patents
Pretreatment method and device for biogas production from sludge Download PDFInfo
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- CN108996865B CN108996865B CN201811067721.9A CN201811067721A CN108996865B CN 108996865 B CN108996865 B CN 108996865B CN 201811067721 A CN201811067721 A CN 201811067721A CN 108996865 B CN108996865 B CN 108996865B
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/02—Biological treatment
- C02F11/04—Anaerobic treatment; Production of methane by such processes
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/14—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E50/00—Technologies for the production of fuel of non-fossil origin
- Y02E50/30—Fuel from waste, e.g. synthetic alcohol or diesel
Abstract
The invention provides a pretreatment method and device for producing methane by sludge, which improves the gas production efficiency and total gas production of the sludge by improving the organic matter content in the sludge and regulating the environment of the sludge, and comprises an original sludge storage pool, a sludge dissolving pool, a tempering pool, a Jie Nian agent adding tank, a water washing pool, a sand removing device, an alkaline hydrolysis pool, a NaOH adding tank, a neutralization pool, a neutralizer adding tank, a conditioning pool, an alkalinity agent adding tank, a concentrating device, a water treatment device and a slurry storage pool.
Description
Technical Field
The invention relates to the field of sludge treatment, in particular to a pretreatment method and device for biogas production from sludge.
Background
Sludge is a byproduct of sewage treatment, the yield is high, the disposal rate is low, and the sludge treatment modes in China mainly include landfill, composting, natural drying, incineration and the like. At present, the sludge treatment mode in China is mainly landfill, and besides, the urban sewage treatment enterprises in China have insufficient treatment capacity and lag treatment means, a large amount of sludge is not subjected to standardized treatment, so that secondary pollution is directly caused, serious threat is caused to the ecological environment, the treatment capacity of sewage treatment facilities is reduced, and meanwhile, the resource is greatly wasted. The anaerobic digestion of sludge is a sludge treatment process for decomposing organic matters in sludge by utilizing facultative bacteria and anaerobic bacteria to perform anaerobic biochemical reaction, so that sludge stabilization is realized, reduction, stabilization, harmlessness and recycling of sludge treatment can be realized, greenhouse gas emission is reduced, and the larger the treatment scale is, the more obvious the comprehensive benefit of the process is. Because the flocculant such as aluminum salt, ferric salt and the like is added in the sewage treatment process, the inorganic salt content in the sludge is higher, the extracellular polymeric substance of the sludge is stable in structure, the organic matter content in the sludge is lower, and finally the biogas production efficiency is low.
Disclosure of Invention
The invention provides a pretreatment method and device for producing methane by sludge, which are used for improving the gas production efficiency and total gas production of the sludge by improving the organic matter content in the sludge and carrying out environmental regulation on the sludge.
The technical scheme adopted by the invention is as follows:
a sludge biogas production pretreatment device, comprising:
the raw mud storage pool is used for storing raw mud of a sewage treatment plant;
the sludge melting tank is used for adjusting the water content of the sludge and is connected with the raw sludge storage tank;
the tempering tank is used for adjusting the viscosity of the sludge and is connected with the sludge dissolving tank;
the adhesive removing and adding tank is used for storing adhesive and is connected with the tempering tank;
the water washing tank is used for washing the conditioned sludge and is connected with the conditioning tank;
the sand removing device is used for removing sand of the sludge after tempering and is connected with the water washing tank;
the alkaline hydrolysis tank is used for alkaline hydrolysis of the sand-containing sludge and is connected with a sand outlet of the sand removal device;
the NaOH dosing tank is used for storing NaOH solution and is connected with the alkaline hydrolysis tank;
the neutralization tank is used for neutralizing the sand-containing sludge after alkaline hydrolysis and is connected with the water washing tank and the alkaline hydrolysis tank;
the neutralizing agent adding tank is used for storing a neutralizing agent and is connected with the neutralizing tank;
the conditioning pond is used for adjusting the alkalinity of the sludge after sand removal and is connected with a sludge outlet of the sand removal device;
the alkalinity agent adding tank is used for storing alkalinity agent and is connected with the conditioning tank;
the concentrating device is used for concentrating the conditioned sludge solution and is connected with the conditioning tank;
the water treatment device is used for treating sewage in the system, the inlet of the water treatment device is connected with the water outlet of the neutralization tank and the water outlet of the concentration device, and the outlet of the water treatment device is connected with the sludge melting tank;
and the slurry storage pool is used for mixing and storing the pretreated sludge and is connected with the liquid outlet of the alkaline hydrolysis pool and the sludge outlet of the concentration device.
A pretreatment method for producing methane by sludge comprises the following steps:
(a) Sludge de-adhesion: adjusting the water content of the sludge to 93% -98.5%, adding an adhesion promoter into the sludge solution, reducing the viscosity of the sludge, washing the sludge solution, reducing the concentration of residual adhesion promoter in the sludge solution, and treating the washed solution;
(b) Removing sand from sludge: the method comprises the steps that (a) the washed sludge is subjected to sand removal treatment, the organic sludge after sand removal is to be treated, naOH solution is added into the removed sand-containing sludge, organic matters in the sand-containing sludge are dissolved, organic matters enter liquid to form concentrated solution, the dissolved sand-containing sludge is mixed with the washed solution in the step (a), neutralizing agent is added for neutralization, the supernatant after neutralization is to be treated, and the neutralized sand grains are used as building material raw materials for recycling;
(c) Adding an alkalinity agent into the organic sludge subjected to sand removal in the step (b), regulating the alkalinity of an organic sludge solution, concentrating the sludge solution subjected to alkali regulation, concentrating water to be treated, and mixing the concentrated organic sludge with the concentrated solution in the step (b) to obtain biogas-producing sludge;
(d) The supernatant after neutralization in the step (b) and the concentrated water in the step (c) enter a sewage treatment device, and one part of the treated supernatant is used for adjusting the water content of the sludge in the step (a), and the other part of the treated supernatant is discharged after reaching the standard.
Further, the adhesive in the step (a) is one or more of hydrochloric acid, sulfuric acid, nitric acid, acetic acid and citric acid.
Further, the adhesive in step (a) is tween-80.
Further, the alkalinity agent in the step (c) is one or more of calcium carbonate, magnesium carbonate and sodium carbonate.
Further, the dosage of the adhesive in the step (a) is 0.2 g/L-0.6 g/L.
Further, the dosage of NaOH in the step (b) is 0.026 g/L-0.67 g/L.
Further, the dosage of the alkalinity agent in the step (c) is 0.02 g/L-0.08 g/L.
The beneficial effects of the invention are as follows:
firstly, the invention improves the organic matter content in the sludge by removing inorganic matters in the sludge and reducing the total amount of the sludge. Secondly, the viscosity of the pretreated sludge solution is reduced, which is beneficial to the escape of methane. And the organic matter content in the sludge biogas residue after anaerobic treatment is about 30%, and the organic matter content in the sludge biogas residue after anaerobic treatment is lower.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a pretreatment device for producing biogas from sludge.
In the figure: 1-raw mud storage tank, 2-mud dissolving tank, 3-conditioning tank, 4-viscosity breaking agent dosing tank, 5-water washing tank, 6-sand removing device, 7-alkaline hydrolysis tank, 8-NaOH dosing tank, 9-neutralization tank, 10-neutralizer dosing tank, 11-conditioning tank, 12-alkalinity agent dosing tank, 13-concentration device, 14-water treatment device and 15-mud storage tank.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The technical scheme adopted by the invention is as follows:
a sludge biogas production pretreatment device, comprising:
a raw mud storage pool 1 for storing raw mud of a sewage treatment plant;
the sludge dissolving tank 2 is used for adjusting the water content of the sludge and is connected with the raw sludge storage tank 1;
the tempering tank 3 is used for adjusting the viscosity of the sludge and is connected with the sludge melting tank 2;
an adhesive adding tank 4 for storing adhesive and connected with the tempering tank 3;
the water washing tank 5 is used for washing the sludge subjected to tempering and is connected with the tempering tank 3;
the sand removing device 6 is used for removing sand of the sludge after tempering and is connected with the water washing tank 5;
the alkaline hydrolysis tank 7 is used for alkaline hydrolysis of the sand-containing sludge and is connected with a sand outlet of the sand removal device 6;
the NaOH dosing tank 8 is used for storing NaOH solution and is connected with the alkaline hydrolysis tank 7;
the neutralization tank 9 is used for neutralizing the sand-containing sludge after alkaline hydrolysis and is connected with the water washing tank 5 and the alkaline hydrolysis tank 7;
a neutralizing agent adding tank 10 for storing a neutralizing agent and connected with the neutralizing tank 9;
the conditioning pond 11 is used for adjusting the alkalinity of the sludge after sand removal and is connected with a sludge outlet of the sand removal device 6;
an alkalinity agent adding tank 12 for storing alkalinity agent and connected with the conditioning tank 11;
the concentrating device 13 is used for concentrating the conditioned sludge solution and is connected with the conditioning tank 11;
the water treatment device 14 is used for treating sewage in the system, the inlet of the water treatment device is connected with the water outlet of the neutralization tank 9 and the water outlet of the concentration device 13, and the outlet of the water treatment device is connected with the sludge melting tank 2;
and a slurry storage tank 15 for mixing and storing the pretreated sludge, which is connected with the liquid outlet of the alkaline hydrolysis tank 7 and the sludge outlet of the concentration device 13.
A pretreatment method for producing methane by sludge comprises the following steps:
(a) Sludge de-adhesion: adjusting the water content of the sludge to 93% -98.5%, adding an adhesion promoter into the sludge solution, reducing the viscosity of the sludge, washing the sludge solution, reducing the concentration of residual adhesion promoter in the sludge solution, and treating the washed solution;
(b) Removing sand from sludge: the method comprises the steps that (a) the washed sludge is subjected to sand removal treatment, the organic sludge after sand removal is to be treated, naOH solution is added into the removed sand-containing sludge, organic matters in the sand-containing sludge are dissolved, organic matters enter liquid to form concentrated solution, the dissolved sand-containing sludge is mixed with the washed solution in the step (a), neutralizing agent is added for neutralization, the supernatant after neutralization is to be treated, and the neutralized sand grains are used as building material raw materials for recycling;
(c) Adding an alkalinity agent into the organic sludge subjected to sand removal in the step (b), regulating the alkalinity of an organic sludge solution, concentrating the sludge solution subjected to alkali regulation, concentrating water to be treated, and mixing the concentrated organic sludge with the concentrated solution in the step (b) to obtain biogas-producing sludge;
(d) The supernatant after neutralization in the step (b) and the concentrated water in the step (c) enter a sewage treatment device, and one part of the treated supernatant is used for adjusting the water content of the sludge in the step (a), and the other part of the treated supernatant is discharged after reaching the standard.
Further, the adhesive in the step (a) is one or more of hydrochloric acid, sulfuric acid, nitric acid, acetic acid and citric acid.
Further, the adhesive in step (a) is tween-80.
Further, the alkalinity agent in the step (c) is one or more of calcium carbonate, magnesium carbonate and sodium carbonate.
Further, the dosage of the adhesive in the step (a) is 0.2 g/L-0.6 g/L.
Further, the dosage of NaOH in the step (b) is 0.026 g/L-0.67 g/L.
Further, the dosage of the alkalinity agent in the step (c) is 0.02 g/L-0.08 g/L.
Example 1
Adding HCl solution into sludge solution, wherein the water content is regulated to 98.5%, washing the sludge solution with water after the reaction is finished, removing sand from the washed sludge, adding NaOH solution into the sand-containing sludge, wherein the water content is regulated to 0.026g/L, dissolving organic matters in the sand-containing sludge, concentrating the dissolved sand-containing sludge, mixing the concentrated sand-containing sludge with the washed solution, adding a neutralizing agent for neutralization, and using the neutralized sand as a building material resource; adding an alkalinity agent of calcium carbonate into the organic sludge after sand removal, concentrating a sludge solution after alkali adjustment, mixing the concentrated organic sludge with a concentrated solution added with a NaOH solution, and concentrating the pretreated biogas-producing sludge after sewage collection in a system, wherein one part of effluent is used for regulating the water content of the sludge, and the other part of effluent is discharged after reaching standards.
Example 2
Adding citric acid solution into a sludge solution, wherein the water content of the citric acid solution is adjusted to be 93%, washing the sludge solution after the reaction is finished, degritting the washed sludge, adding NaOH solution into the sandy sludge, dissolving organic matters in the sandy sludge, concentrating the dissolved sandy sludge, mixing the concentrated sandy sludge with the washed solution, adding a neutralizing agent for neutralization to be neutral, and taking the neutralized sand as building material raw materials for recycling; adding an alkalinity agent sodium carbonate into the organic sludge after sand removal, concentrating a sludge solution after alkali adjustment, wherein the dosage is 0.08g/L, mixing the concentrated organic sludge with a concentrated solution added with a NaOH solution, and collecting and concentrating sewage in a system as pretreated biogas-producing sludge, wherein one part of effluent is used for regulating the water content of the sludge, and the other part of effluent is discharged after reaching standards.
Example 3
Adding Tween-80 solution into a sludge solution, wherein the water content is regulated to be 97%, washing the sludge solution with water after the reaction is finished, degritting the washed sludge, adding NaOH solution into the sandy sludge, dissolving organic matters in the sandy sludge, concentrating the dissolved sandy sludge, mixing the concentrated sandy sludge with the washed solution, adding a neutralizing agent for neutralization to be neutral, and taking the neutralized sand as building material raw material for recycling; adding a mixture of an alkalinity agent sodium carbonate and calcium carbonate into the organic sludge after sand removal, concentrating a sludge solution after alkali adjustment, mixing the concentrated organic sludge with a concentrated solution added with a NaOH solution, and concentrating the concentrated organic sludge as pretreated biogas-producing sludge after sewage collection in a system, wherein one part of effluent is used for regulating the water content of the sludge, and the other part of effluent is discharged after reaching the standard.
Claims (7)
1. The pretreatment method for producing methane by sludge is characterized by comprising the following steps:
(a) Sludge de-adhesion: adjusting the water content of the sludge to 93% -98.5%, adding an adhesion promoter into the sludge solution to reduce the viscosity of the sludge, washing the sludge solution, reducing the concentration of residual adhesion promoter in the sludge solution, and treating the washed solution;
(b) Removing sand from sludge: the method comprises the steps that (a) the washed sludge is subjected to sand removal treatment, the organic sludge after sand removal is to be treated, naOH solution is added into the removed sand-containing sludge, organic matters in the sand-containing sludge are dissolved, organic matters enter liquid to form concentrated solution, the dissolved sand-containing sludge is mixed with the washed solution in the step (a), neutralizing agent is added for neutralization, the supernatant after neutralization is to be treated, and the neutralized sand grains are used as building material raw materials for recycling;
(c) Adding an alkalinity agent into the organic sludge subjected to sand removal in the step (b), regulating the alkalinity of an organic sludge solution, concentrating the sludge solution subjected to alkali regulation, concentrating water to be treated, and mixing the concentrated organic sludge with the concentrated solution in the step (b) to obtain biogas-producing sludge;
(d) The supernatant after neutralization in the step (b) and the concentrated water in the step (c) enter a sewage treatment device, and one part of the treated supernatant is used for adjusting the water content of the sludge in the step (a), and the other part of the treated supernatant is discharged after reaching the standard;
the pretreatment device for the pretreatment method for producing methane by the sludge comprises,
a raw mud storage pool (1) for storing raw mud of a sewage treatment plant;
the sludge dissolving tank (2) is used for adjusting the water content of the sludge and is connected with the raw sludge storage tank (1);
the tempering tank (3) is used for adjusting the viscosity of the sludge and is connected with the sludge dissolving tank (2);
an adhesive-releasing agent adding tank (4) for storing adhesive and connected with the tempering tank (3);
the water washing tank (5) is used for washing the sludge subjected to tempering and is connected with the tempering tank (3);
the sand removing device (6) is used for removing sand of the sludge after tempering and is connected with the water washing tank (5);
the alkaline hydrolysis tank (7) is used for alkaline hydrolysis of the sand-containing sludge and is connected with a sand outlet of the sand removal device (6);
the NaOH dosing tank (8) is used for storing NaOH solution and is connected with the alkaline hydrolysis tank (7);
the neutralization tank (9) is used for neutralizing the sand-containing sludge after alkaline hydrolysis and is connected with the water washing tank (5) and the alkaline hydrolysis tank (7);
a neutralizing agent adding tank (10) for storing a neutralizing agent and connected with the neutralizing tank (9);
the conditioning tank (11) is used for adjusting the alkalinity of the sludge after the sand removal and is connected with a sludge outlet of the sand removal device (6);
an alkalinity agent adding tank (12) for storing alkalinity agent and connected with the conditioning tank (11);
the concentrating device (13) is used for concentrating the conditioned sludge solution and is connected with the conditioning tank (11);
the water treatment device (14) is used for treating sewage in the system, the inlet of the water treatment device is connected with the water outlet of the neutralization tank (9) and the water outlet of the concentration device (13), and the outlet of the water treatment device is connected with the sludge melting tank (2);
and the slurry storage pool (15) is used for mixing and storing the pretreated sludge and is connected with the liquid outlet of the alkaline hydrolysis pool (7) and the sludge outlet of the concentration device (13).
2. The pretreatment method for biogas production from sludge according to claim 1, wherein the binder in the step (a) is one or more of hydrochloric acid, sulfuric acid, nitric acid, acetic acid and citric acid.
3. The pretreatment method of biogas production from sludge according to claim 1, wherein the viscosity-releasing agent in the step (a) is tween-80.
4. The pretreatment method for biogas production from sludge according to claim 1, wherein the alkalinity agent in the step (c) is one or more of calcium carbonate, magnesium carbonate and sodium carbonate.
5. The pretreatment method for biogas production from sludge according to claim 1, wherein the addition amount of the binder in the step (a) is 0.2g/L to 0.6g/L.
6. The pretreatment method for biogas production from sludge according to claim 1, wherein the dosage of NaOH in the step (b) is 0.026g/L to 0.67g/L.
7. The pretreatment method for biogas production from sludge according to claim 1, wherein the adding amount of the alkalinity agent in the step (c) is 0.02g/L to 0.08g/L.
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| CN112592015B (en) * | 2020-12-16 | 2022-05-27 | 同济大学 | Method for promoting anaerobic digestion of sludge to produce methane |
| CN113880382A (en) * | 2021-11-24 | 2022-01-04 | 天津壹新环保工程有限公司 | Anaerobic sludge recycling treatment system and method |
| CN114275983A (en) * | 2021-12-08 | 2022-04-05 | 天津壹新环保工程有限公司 | Sludge anaerobic treatment system and method |
| CN114133126A (en) * | 2021-12-17 | 2022-03-04 | 天津壹新环保工程有限公司 | Sludge carbonization treatment system and method |
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